Machinery for pulverizing ore



( No Model.)

F. J, & W. 5.30m MACHINERY FOR 'PULVERIZING ORE, 8:0. v No. 256.322.

Patented Apr 11.1882.

v ATTORNEY I WITNESSES:

N, PETERS. PMIO-Lkhugmphur. Washington D. D.

vUNITED STATES PATENT owes I FREDERICK J. HOYT, OF NEW YORK, N. Y., AND WILLIAM H. HOYT, OF JERSEY CITY, NEW JERSEY.

MACHINERY FOR PUILVERIZINVG ORE, s60.

SPECIFICATION forming part of Letters Patent No. 256,322, dated April 11, 1882.

Application filed May 14, 1881. (No model.)

To all whom it may concern:

Be it known that we, FREDERICK J. Hor r and WILLIAM H. HoY'r, citizens of the United States, and residing respectively at New York city, in the county and State of New York, and at Jersey City, in the county of Hudson and State of New Jersey, haveinvented a new and useful Improvement in Machinery for Pulvcrizing Ore, &c., of which the following is a specification.

This invention relates to machinery for pulverizing ore or other similar materials.

The object of this invention is to provide an efficient machine for reducing ores to powder; and to this end the invention consists in the combination, with a vertical rotary spindle, of grinding disks secured thereon and formed with smooth beveled edges, and a shell having smooth beveled inner faces, the said grindingdisks successively increasing in diameter from the top to the bottom of the series, all as will be more fully hereinafter described in detail.

This inventionis illustrated in the accompanying drawings, in which- Figure 1 represents avertical central section Fig. 2, a horizontal section.

Similar letters of reference indicate corresponding parts.

The letter A designates the shaft or spindle; B, the grinding-disks; O, the shell, and D the set-screw.

The shaft A is provided with a pulley, e, for imparting thereto a revolving motion, and the disks B are fixed thereto by means of a feathenkey, f, engaging .the hub 9 thereof. These disks B are beveled at their outer edges in an upper direction, as at h, and the inner surface of the shell 0 is beveled or tapered correspondingly to said edgesof the disks, as at 13, while the diameters of the disks gradually increase from top to bottom of the machine. The shell 0 is made in sections, one to each of the grinding-disks, each section being beveled or tapered in the manner aforesaid. We do not, however,

confine ourselves to making the outsidecasing in sections, as they may be made in one continuous cylinder, or otherwise, if necessary.

' The set-screw D is fitted into a block, 70, and forms a step for the shaft A, so that by a falling on the upper grinding-disk, is carried to the outer edge of the disk both by its inclination and the centrifugal force due to its revolution. The material is then caught between the beveled edge of the disk and the inner surface of the shell, whereby it is gradually reduced to powder, whence it falls on the next lower disk, and so on, finally escaping through a spout, n, extending from an inclined plate at the bottom of the shell.

By raising or lowering the shaft'A the beveled edge of the disks B approach or recede from the beveled inner surface of the shell 0, and hence the effect'of the disks can thus be regulated with nicety.

The beveled edges of the grinding-disks may he graduated by providing the edges of each disk with difi'erent angles,as shown. The disks may be made also level on top, or inclined inward, or otherwise, if necessary.

It will be observed that the disks have smooth beveled edges, and that the shell has smooth inner beveled faces; also, that the shell is made in sections, and that each section can be cast in molds made by the same pattern, which cannot be accomplished in making the shell of conical shape.

If the faces of the grinding-disks and the inner sides of the shell were made rough, the ore could not be reduced to powder, as is the case withour machine. By beveling the inner sides of the sections of shell the ore will evidently be more effectively pulverized than if the said sides were vertical, since the ore must be subjected to considerable grinding action before passing by a disk.

Having thus described our invention, what we claim as new, and desirc to seculte by Letters Patent, is-

The combination, with the verticalirotary spindle, of the grinding-disks B,secured therehave hereunto set our hands this 13th day of on and formed with smooth beveled edges, and May, 1881.

the shell having the smooth beveled inner FREDERICK J. HOYT. faces, 1', said grinding-disks successively in- WILLIAM H. HOYT.

5 creasingin diameterfroin the top to the bottom Witnesses:

- of the series, substantially as described. FRANCIS CLARE BOWEN,

In testimony that we claim the foregoing we EDGAR GARRETSON. 

